# AUTHOR: DING
# -*- codeing = utf-8 -*-
# @Time: 2024/2/1 16:46
# @Author: 86139
# @Site: 
# @File: 02-autograd.py
# @Software: PyCharm

import torch
from torch import autograd

x = torch.tensor(1.)
a = torch.tensor(1., requires_grad=True)
b = torch.tensor(2., requires_grad=True)
c = torch.tensor(3., requires_grad=True)

y = a ** 2 * x + b * x + c
print('before:',a.grad,b.grad,c.grad)
grads = autograd.grad(y,[a,b,c])
print('after:',grads[0],grads[1],grads[2])
